change packages

[flutterWang]

because of flutter 1.9, you can change "package:flutter_web/material.dart" to "package:flutter/material.dart" and others where need to change , if you want, i can do it for you.

thanks for the repository, I will use it as my homepage.

i love this repository very much.

[zubairehman]

Thanks for the kind words.
I will comit the latest changes soon that includes migration to 1.9

[flutterWang]

I have forked your repository and changed it.